79978320 has 160 divisors (see below), whose sum is σ = 280458240. Its totient is φ = 20943360.

The previous prime is 79978313. The next prime is 79978321. The reversal of 79978320 is 2387997.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79978321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 131457 + ... + 132063.

It is an arithmetic number, because the mean of its divisors is an integer number (1752864).

Almost surely, 2^79978320 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79978320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140229120).

79978320 is an abundant number, since it is smaller than the sum of its proper divisors (200479920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

79978320 is a wasteful number, since it uses less digits than its factorization.

79978320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690 (or 678 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The square root of 79978320 is about 8943.0598790347. The cubic root of 79978320 is about 430.8480110364.

The spelling of 79978320 in words is "seventy-nine million, nine hundred seventy-eight thousand, three hundred twenty".